Ok, here's resolution: The amount if pixels being displayed on screen at a time. So, your phone, assuming it's an iPhone 6 or better, is probably 1440p resolution, which is a very clear image. The most basic clear image you can get is 1080p, and it appears this image is probably about 480p to 726p, which is not clear. Hence the name "Low resolution" because the pictures resolution is below the basic clear image threshold.